Image reject receiver
First Claim
1. An image reject receiver, using a multi-low-intermediate frequency and a zero-intermediate frequency, the image reject receiver comprising:
- a first low-intermediate frequency receiver, for receiving an image signal and transferring the image signal into an mirrored image signal by using a first intermediate frequency as a carrier in the first low-intermediate frequency receiver;
a zero-intermediate frequency receiver, for receiving the mirrored image signal by using a zero-intermediate frequency as a carrier and suppressing the frequency of the mirrored image signal to zero; and
a second low-intermediate frequency receiver, for receiving the suppressed mirrored image signal outputted from the zero-intermediate frequency receiver and transferring the frequency of the suppressed mirrored image signal from zero to a second intermediate frequency.
1 Assignment
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Accused Products
Abstract
An image reject receiver is provided. The image reject receiver includes a first type low-intermediate frequency receiver, a zero-intermediate frequency receiver and a second low-intermediate frequency receiver. The first type low-intermediate frequency receiver is used for receiving image signal and transferring the image signal into a mirrored image signal with a frequency used in the first low-intermediate frequency receiver. The mirrored image signal is sent to the zero-intermediate frequency receiver and is suppressed to a zero frequency. The signal with the zero frequency is outputted to the second low-intermediate frequency receiver and is then transferred to be with the second intermediate frequency for easily demodulating in the following operation.
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Citations
13 Claims
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1. An image reject receiver, using a multi-low-intermediate frequency and a zero-intermediate frequency, the image reject receiver comprising:
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a first low-intermediate frequency receiver, for receiving an image signal and transferring the image signal into an mirrored image signal by using a first intermediate frequency as a carrier in the first low-intermediate frequency receiver;
a zero-intermediate frequency receiver, for receiving the mirrored image signal by using a zero-intermediate frequency as a carrier and suppressing the frequency of the mirrored image signal to zero; and
a second low-intermediate frequency receiver, for receiving the suppressed mirrored image signal outputted from the zero-intermediate frequency receiver and transferring the frequency of the suppressed mirrored image signal from zero to a second intermediate frequency. - View Dependent Claims (2, 3, 4, 5)
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6. An image reject receiver, comprising:
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a first low-intermediate frequency receiver, for receiving an image signal and transferring the image signals into a mirrored image signal by using a first intermediate frequency as a carrier;
a zero-intermediate frequency receiver, including a DC calibration circuit, for receiving the mirrored image signal with the first intermediate frequency and transferring the mirrored image signal into a suppressed mirrored image signal, wherein the DC calibration circuit is used for eliminating DC offsets generated by the zero-intermediate frequency receiver. a second low-intermediate frequency receiver, for receiving the suppressed mirrored image signal and transferring the suppressed mirrored image signal into a signal with a second intermediate frequency used in the second low-intermediate frequency receiver; and
a synthesizer, for providing a local oscillating signal used in the first low-intermediate frequency receiver. - View Dependent Claims (7, 8)
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9. An image reject receiver, which comprising:
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a first intermediate frequency receiver, for receiving an image signal and transferring the image signal into an mirrored image signal by using a first intermediate frequency as a carrier;
a zero-intermediate frequency receiver, for receiving the mirrored image signal by using a zero-intermediate frequency as a carrier and suppressing the frequency of the mirrored image signal to zero; and
a second intermediate frequency receiver, for receiving the suppressed mirrored image signal and transferring the frequency of the suppressed mirrored image signal from zero to a second intermediate frequency. - View Dependent Claims (10, 11, 12, 13)
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Specification